How to create Object[][] from ArrayList<Object[]> in java

Question

i have a ArrayList with ObjectArrays like this:

ArrayList<Object[]> objectList = new ArrayList<Object[]>();

i would like to convert it to:

Object[][] objectListAsArray = ...

My first thought was to convert the list with objectArrays to an array:

objectList.toArray()

... but this will only return a single Object[] . Can someone help me to find a solution?

Regards mmm...

Answer 1

Object[][] array = list.toArray(new Object[list.size()][]);

As Peter noted, your Object[] will be shared between the list and the array. If you want different arrays, you'd have to iterate the list and copy the arrays.

Answer 2

只需尝试：

Object[][] objectListAsArray = objectList.toArray(new Object[0][]);